From personal experience, the hardest part of an office job is putting up with all the conformity and bureaucracy and politics. For a lot of people in lower skill jobs, they may just not be interested in that stuff (also a reason people didn't go to more education). And so if front line service jobs are getting dominated by all the corporate stuff we have to put up with, I can imagine that pushing more people out of the system. Even things as trivial as having to email or fill out a job application online probably exclude many people. Not to mention having to be monitored by an app, etc.
Anyway, just a theory, I'm really just curious to know if this could be a factor based on what people's experience is in these kind of jobs.